—Another cup of tea?—No,thanks. I_______ be off. Gina is waiting for me.A. can b. must c. may
--There may____ two new schools in the neighborhood. -- I hear that one is a primary school, the other is a high school.
I will go on with the experiment unless my mother _____ me to stop.
____ they are working ! We should learn from them.
–The little boy seldom puts away his toys by himself, does he? -- _____. So his mother has to do it for him.
The tiger is now in danger of disappearing. So more attention ____ to protecting the tiger.